To assess the effect of glimepiride on the PK of dapagliflozin and the effect of dapagliflozin on the PK of glimepiride, when co-administered in healthy subjects (Phase A) and to assess the effect of sitagliptin on the PK of dapagliflozin and the effect of dapagliflozin on the PK of sitagliptin, when co-administered in healthy subjects (Phase B)